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/*
* Copyright (C) Miroslav Lichvar 2015
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
/* Check the frequency range of the system ntp_adjtime() implementation */
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <sys/time.h>
#include <sys/timex.h>
static int
try_ntpadjtime(struct timex *t)
{
int r;
r = ntp_adjtime(t);
if (r < 0)
printf("ntp_adjtime() failed : %s ", strerror(errno));
return r;
}
static void
reset_ntpadjtime(void)
{
struct timex t;
t.modes = MOD_OFFSET | MOD_FREQUENCY;
t.offset = 0;
t.freq = 0;
try_ntpadjtime(&t);
}
static void
test_freqrange(void)
{
struct timex t;
int i;
printf("freq range:\n");
for (i = -1000; i <= 1000; i += 50) {
t.modes = MOD_FREQUENCY;
t.freq = i * (1 << 16);
printf("%4d ppm => ", i);
if (try_ntpadjtime(&t) < 0)
continue;
printf("%4ld ppm : ", t.freq / (1 << 16));
printf("%s\n", t.freq == i * (1 << 16) ? "ok" : "fail");
}
}
int
main()
{
test_freqrange();
reset_ntpadjtime();
return 0;
}
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